Mine is type O and is Rh negative (of course HLA-B27 positive)
I have read (google it) that type O blood can make a Tendon rupture more likely (my tendons injure very easily) and that rh- in conjunction with hla-b27 can trigger the immune system to cause rheumatic problems.
Do you have any info ?

Updated
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O negative.
HLA-B27+
RF negative
ANA negative
CRP normal
X-ray sacroilitis
PAIN

Last edited by markos; 03/30/09 11:14 AM.